Document Details

Document Type : Article In Journal 
Document Title :
EFFECT OF GROWTH TEMPERATURE AND TEMPERATURE TRANSITION ON STEREOSPECIFIC DISTRIBUTION OF F ATTY ACIDS IN APHANIZOMENQV SF. GLYCEROLIPIDS
تاثير درجة الحرارة على نمو الافانيزومينو وتاثير تغيير درجات الحرارة على مكان توزيع الاحماض الدهنية الموجودة في الجلييسروليبدات
 
Subject : Biochemistry 
Document Language : English 
Abstract : In this study of Aphanizomenon sp. culture grown at either 28°C or 15°C or during temperature transition from 28°C to 15°C were investigated for the stereospecific distribution of fatty acid in the major glycerolipid classes. The results indicated that the positional distribution of fatty acid in all lipid classes from culture grown at 28°C and 15°C were characterized by the predominance of C-18 fatty acid at the sn-i position and C-16 fatty acid at the sn-2 position, in a pattern consistent with that described for other group 2 cyanobacteria. Cells growth at 15°C were characterized by high proportion of unsaturation fatty acids compared to growth at 28°C. The increase in the degree of unsaturation were induced essentially by increasing C18:3 at sn-i position in MGDG and DGDG and increasing C16:3 at sn-2 in PG. The positional distribution was not altered except that in the PG fraction, the C 16:1 was esterified in sn- 1 position instead of sn-2 position in cell grown at 15°C. In changing the growth temperature from 28°C to 15°C (24h and 48h) the Stereospecific distribution of fatty acid at Sn-i and sn-2 glycerolipid was largely conserved with C- 16 fatty acid dominating at sn-2 and C-I 8 fatty acid dominating at sn- I. The most prominent change induced by shift to lower temperature was decrease in Ci 8:1. and Cl 8:3 level at sn-I accompanied by an increase in C 16:3 at both sn-I and sn-2 for MGDG. 
ISSN : 1687-2045 
Journal Name : journal of biological and pharmaceutical sciences 
Volume : 3 
Issue Number : 1 
Publishing Year : 1426 AH
2005 AD 
Article Type : Article 
Added Date : Saturday, February 16, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
خالد عمر ابو النجاabualnaja, khaled omerResearcherDoctoratekabualnaja@kau.edu.sa

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